BQ3285E Series
RTC IC with 242x8 NVSRAM Alarm Wake-up
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
RTC IC with 242x8 NVSRAM Alarm Wake-up
| Part | Package / Case [y] | Package / Case [x] | Package / Case | Current - Timekeeping (Max) [Max] | Features | Supplier Device Package | Operating Temperature [Max] | Operating Temperature [Min] | Interface | Time Format | Type | Voltage - Supply [Max] | Voltage - Supply [Min] | Mounting Type | Memory Size |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ3285ES | 7.5 mm | 0.295 in | 24-SOIC | 300 µA | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | 24-SOIC | 70 ░C | 0 °C | Parallel | HH:MM:SS (12/24 hr) | Clock/Calendar | 5.5 V | 4.5 V | Surface Mount | 242 B |
Key Features
• Direct clock/calendar replacement for IBM® AT-compatible computers and other applicationsFunctionally compatible with the DS1285Closely matches MC146818A pin configuration2.7–3.6V operation (bq3285L);4.5–5.5V operation (bq3285E)242 bytes of general nonvolatile storage32.768kHz output for power managementSystem wake-up capability—alarm interrupt output active in battery-backup modeLess than 0.5µA load under battery operationSelectable Intel or Motorola bus timing14 bytes for clock/calendar and controlBCD or binary format for clock and calendar dataCalendar in day of the week, day of the month, months, and years, with automatic leap-year adjustmentTime of day in seconds, minutes, and hours12- or 24-hour formatOptional daylight saving adjustmentProgrammable square wave outputThree individually maskable interrupt event flags:Periodic rates from 122us to 500msTime-of-day alarm once per second to once per dayEnd-of-clock update cycle24-pin plastic DIP, SOIC, or SSOPDirect clock/calendar replacement for IBM® AT-compatible computers and other applicationsFunctionally compatible with the DS1285Closely matches MC146818A pin configuration2.7–3.6V operation (bq3285L);4.5–5.5V operation (bq3285E)242 bytes of general nonvolatile storage32.768kHz output for power managementSystem wake-up capability—alarm interrupt output active in battery-backup modeLess than 0.5µA load under battery operationSelectable Intel or Motorola bus timing14 bytes for clock/calendar and controlBCD or binary format for clock and calendar dataCalendar in day of the week, day of the month, months, and years, with automatic leap-year adjustmentTime of day in seconds, minutes, and hours12- or 24-hour formatOptional daylight saving adjustmentProgrammable square wave outputThree individually maskable interrupt event flags:Periodic rates from 122us to 500msTime-of-day alarm once per second to once per dayEnd-of-clock update cycle24-pin plastic DIP, SOIC, or SSOP
Description
AI
The CMOS bq3285E/L is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The bq3285L supports 3V systems. Other bq3285E/L features include three maskable interrupt sources, square-wave output, and 242 bytes of general nonvolatile storage.
A 32.768kHz output is available for sustaining power-management activities. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode.
The bq3285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.
The bq3285E/L is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The only external components are a 32.768kHz crystal and a backup battery.
The CMOS bq3285E/L is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The bq3285L supports 3V systems. Other bq3285E/L features include three maskable interrupt sources, square-wave output, and 242 bytes of general nonvolatile storage.
A 32.768kHz output is available for sustaining power-management activities. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode.
The bq3285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.
The bq3285E/L is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The only external components are a 32.768kHz crystal and a backup battery.